The Modular Advanced Armed Robotic System, or MAARS. I have included some textured and wireframe renders, rendered with Arnold, in Maya 2017. I have created textures and materials in substance, and then brought it back into Maya, to render out in Arnold.
Below is a link to more information about the bot, and what I used as my main source of reference.
Brad Mancer Design - MAARS® Modular Advanced Armed Robotic System